Is your Postgres migration safe or not safe?

A website called SafenotSafe dev provides a simple, interactive way to determine whether a Postgres migration is safe or not. The website asks users to input the SQL commands of the migration and the current and target Postgres versions. It then uses a complex algorithm to analyze the migration and provide a result. The website is based on the 'pg_upgrade' tool, which is a command-line tool for upgrading Postgres databases. The tool was developed by the Postgres community and is widely used for upgrading Postgres versions. The algorithm used by SafenotSafe dev is based on the 'pg_upgrade' tool's checks and is designed to identify potential issues with the migration.